E-mode noise

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Charliebee9

New Member
Joined
May 21, 2021
Messages
16
Location
Blackburn
Car
C350e
wonder if someone can help, I was parked up and switched car to E-mode and noticed I could hear a noise kinda like a whirling/radio noise? If that makes sense, anyone have any idea what it may be?
 
Usually any prolonged noise after ignition switch off is due to a cooling fan or coolant circulating pump of some sort still running till something cools down.
 

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